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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:#222222">On behalf of the organizing committee we would like to draw your attention to the PSW.3 session “Preparation for a New Ionospheric
Space Weather Scale for Trans-ionospheric Radio wave Propagation” at the 45th COSPAR Scientific Assembly that takes place in Busan, South Korea from 13 – 21 July 2024. We kindly invite you to contribute to the session (session description below) and submit
an abstract before the deadline February 16, 2024. Submission details you can find here: <a href="https://www.cospar2024.org/" target="_blank"><span style="color:#0563C1">https://www.cospar2024.org/</span></a>.</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222"><o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:#222222"> </span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222"><o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222">Session Title: <b>Preparation for a new ionospheric space weather scale for trans-ionospheric radio wave propagation</b><o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222"> <o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222">Main goal is to pave the way for defining a new NOAA Ionospheric Space Weather<br>
Scale to augment the current geomagnetic storms (G), solar radiation storms (S), and<br>
radio blackouts (R) Scales. The recommendation for a new “T” scale will target<br>
applications and systems that are impacted by disturbances in trans-ionospheric radio<br>
wave propagation, such as satellite communication, remote sensing radars, and global<br>
Navigation Satellite Systems (GNSS) navigation, positioning, and timing. To reach this<br>
goal, broad international discussion and collaboration is required organized by the<br>
ISWAT G2B-04 activity initiated by COSPAR. In addition, the Coordinated Ionospheric<br>
Study on Scales and Indices (CISSI) established via ISWAT G2B-04 will provide an<br>
excellent data base for comparative studies and related conclusions on indices and their<br>
application potential. The session will include contributions related to how to combine<br>
ground and space-based data sources to maximize data coverage used to drive the<br>
new scale, establishing the relationship between the various indices, validation,<br>
suggestions for defining the thresholds levels for the scale and occurrence rates, and<br>
exploring the inclusion of probabilities. Papers are also encouraged exploring and<br>
identifying user needs, and how a new scale would target different user applications.<o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222"><o:p> </o:p></span></p>
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<span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:#222222">Sincerely,</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222"><o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:#222222">Norbert Jakowski and Tim Fuller-Rowell</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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